The **M2REB-S3A-R2** is a specific electronic component, typically categorized as a **Micro-SD Card Connector** or a specialized **Memory Card Socket**. These parts are designed for surface-mount technology (SMT) and are commonly found in mobile devices, IoT hardware, and embedded systems. --- ### 1. Technical Specifications The "M2REB" series generally features a push-push or push-pull mechanism with a low profile to save vertical space on a Printed Circuit Board (PCB). | Feature | Specification | | :--- | :--- | | **Component Type** | Micro-SD (TF) Card Connector | | **Mounting Type** | SMT (Surface Mount Technology) | | **Number of Pins** | 8 Main Pins + Shell/Grounding Leads | | **Pitch** | 1.10 mm (Standard for Micro-SD) | | **Orientation** | Right Angle / Horizontal | | **Mechanism** | Reverse Type (Commonly "Bottom Mount") | ### 2. Physical Construction The part is composed of three primary materials to ensure electrical integrity and mechanical durability: * **Housing:** High-temperature thermoplastic (LCP - Liquid Crystal Polymer), capable of withstanding reflow soldering temperatures (up to 260°C). * **Contacts:** Copper alloy with selective gold plating (to prevent corrosion and ensure high conductivity during frequent card insertions). * **Shell:** Stainless steel or nickel-plated steel for EMI shielding and structural rigidity. --- ### 3. Pinout Configuration Standard Micro-SD connectors like the M2REB series follow the SD Association pin mapping: | Pin # | Name | Function | | :--- | :--- | :--- | | 1 | DAT2 | Data Line [Bit 2] | | 2 | CD/DAT3 | Card Detect / Data Line [Bit 3] | | 3 | CMD | Command/Response | | 4 | VDD | Supply Voltage (2.7V - 3.6V) | | 5 | CLK | Clock | | 6 | VSS | Supply Voltage Ground | | 7 | DAT0 | Data Line [Bit 0] | | 8 | DAT1 | Data Line [Bit 1] | --- ### 4. Key Design Advantages * **Reverse Mount (-R2):** The "R2" suffix often denotes a "Reverse" orientation. Unlike standard top-mount connectors, this is soldered to the bottom of the PCB or designed so the card is inserted with the contacts facing "up" relative to the board, allowing for thinner device designs. * **Card Detection Switch:** Includes an internal mechanical switch that closes/opens when a card is fully inserted, allowing the system's MCU to trigger a "Mount" command. * **EMI Shielding:** The metal casing is grounded to the PCB to reduce electromagnetic interference, which is critical for high-speed data transfer.